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储层微观孔隙结构是影响储层储渗特性的重要因素。很多研究表明 ,储层微观孔隙结构具有分形特征。但是 ,由于储层微观孔隙结构不易用肉眼去分辨 ,所以使得储层微观非均质性研究一直难以深入进行下去。文章将PIA技术与分形理论相结合 ,在“计盒法”的基础上推导出了一种新的分形分析方法。该方法简单易行 ,且不受人为因素影响。利用该方法 ,对某油田三口井共 16个砂岩薄片和 2个碳酸岩盐薄片进行了分析 ,结果发现该方法较传统非均质性分析方法更能准确地表征储层微观孔隙结构的非均质程度。
Micro-pore structure of reservoirs is an important factor affecting reservoir permeability and permeability. Many studies have shown that fractal characteristics of reservoir microscopic pore structure. However, the study of micro-heterogeneity in reservoirs has been difficult to study in depth because the microscopic pore structure of reservoirs is not easily discernible with the naked eye. The article combines PIA technology with fractal theory, and deduces a new fractal analysis method based on “box counting method”. The method is simple and not affected by human factors. Using this method, a total of 16 sandstone slices and 2 carbonate rock slices of three wells in an oilfield were analyzed. The results show that the proposed method can more accurately characterize the heterogeneity of micro-pore structure of reservoir than traditional heterogeneity analysis methods degree.